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Date:   Tue, 2 Dec 2003 14:23:16 -0500
Reply-To:   Ian Whitlock <WHITLOI1@WESTAT.COM>
Sender:   "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:   Ian Whitlock <WHITLOI1@WESTAT.COM>
Subject:   Re: ***PROBLEM USING RANUNI AND FLOOR FUNCTION TO CREATE FAKE DAT A***
Comments:   To: Cybie Frontier <cybie@HOTMAIL.COM>
Content-Type:   text/plain

Cybie,

The RANUNI function has one seed stream in the DATA step. You apprently want two streams the same. You could use the corresponding CALL routine with two seeds starting with the same value. Or simpler,

data sales1; do i=1 to 5; Check=(ranuni(12345)*6); Prod_Num=floor(check); output; end; run ;

proc print data=sales1; run;

IanWhitlock@westat.com

-----Original Message----- From: Cybie Frontier [mailto:cybie@HOTMAIL.COM] Sent: Tuesday, December 02, 2003 2:13 PM To: SAS-L@LISTSERV.UGA.EDU Subject: ***PROBLEM USING RANUNI AND FLOOR FUNCTION TO CREATE FAKE DATA***

Hi Folks:

This is kind of perplexing but I am sure there is definitely a logical explanation for it. I have been trying to generate some fake data using the following code. The "Check" variable is there to check the value of the variable before the floor function is applied to it.

data sales1; do i=1 to 5; Prod_Num=floor(ranuni(12345)*6); Check=(ranuni(12345)*6); output; end;

proc print data=sales1; run;

The output that I am getting is:

Obs i Prod_Num Check 1 1 2 4.47117 2 2 4 1.65766 3 3 1 4.37330 4 4 0 4.40591 5 5 4 4.58448

Now, if I apply the floor function to 4.47117 I should get 4 and not 2 as in OBS 1. But The Prod_Num is 2 in OBS=1. Similar anomalies exist for all other obs. What is the explanation for this anomaly?

Thank you very much for your help.

- CF

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